Boom for excavating machines



Sept. 1, 1936.

R. E. LJUNGKULL BOOM FOR 'EXCAVATING MACHINES Original Fiied April 25, 1 934 2 Sheets-Sheet l 9 u 0 o m N Invenicr: ungkuli.

OXQMAQ Sept. 1, 1936.

R. E. LJUN GKU-LL BOOM FOR EXCAVATING MACHINES- 2 Sheets-Sheet 2 Original Filed April 25, 1934 Inveni'ofi Rolf E L ungkum. a W3 ttorneg g.

Patented Sept. 1, 1936 UNITED STATES 'ATENT OFFIQE 2,053,157 BOOM FOR EXCAVATING MACHINES Rolf E. Ljungkull, St.

Paul, Minn., assignor to American Hoist andl Derrick Company, St. Paul, Minn., a corporation of Delaware 8 Claims.

This application is a division of my pending application Serial No. 721,983, for Excavating machines, filed April 23, 1934.

The invention relates to a boom for excavating or like machines, and the general object of the invention is to provide a boom wherein will be incorporated various improved features and characteristics of construction novel both as individual entities of the boom and in combination with each other.

A further object is to provide boom construction wherein will be included a new and improved arrangement of means for detachably connecting separate sections of a boom to each other.

And a further object is to provide boom construction which will include a new and improved arrangement or means for detachably mounting a boom upon the platform of an excavating or like machine.

With the above objects in view, as well as others which will appear as the specification proceeds, the invention comprises the construction, arrang'ement and combination of parts as now to be fully described and as hereinafter to be specifically claimed, it being understood that the disclosure herein is merely illustrative and intended in no way in a limiting sense, changes in details of construction and arrangement of parts being permissible so long as within the spirit of the invention and the scope of the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. I is a side elevational view disclosing the lower or inner portion of a boom made according to the invention; 7

Fig. 2 is a si'd'eelevational view of the upper or outer portion of the boom of Fig. 1, parts being broken away; i

Fig. 3 is an enlarged fragmentary side eleva-'- tional view' detailing features of the boom;

Fig.4 is a detail sectional view of the boom, taken on line 44 in Fig. 3; r

Fig. 5 is a view detailing the manner of attaching T-bars of the boom to angle barsthereof;

Fig. 6 is a detail sectional view of the boom, taken on line 6-6 in Fig. 2-; V I

Fig. 7 is a top plan view of the lower or inner portion of the boom, disclosing the mounting therefor;

Fig. 8 is a top plan view of the upperlor outer portion of the boom of- Fig. '7, parts being broken away;

Fig. 9 is a detail sectional view of the boom, taken on line .9'-9 in Fig. 7

Fig. 10 is a detail sectional view of the boom, taken as on line I0.I0 in Fig. 9; and v Fig. 11 is a detail sectional view of the mounting for the boom.

' With respect to the drawings and the numerals of reference thereon, the boom is constructed in bottom and top sections, represented I5 and I6, each ofwhich bottom and top sections includes longitudinally extending angle pieces, indicated I l, there'being an angle piece I! having the apex thereof defining each of the four corners of the boom.

The angle pieces of the boom adjacent to or at the upper surface thereof are denoted I8, I8, and the angle pieces adjacent to or at the lower surface of the boom are represented I9, I9. The boom is, speaking generally, of greater width than thickness, the angle pieces I8, I8 and the angle pieces l9, I9, respectively, being spaced apart at greater distance than are each upper angle piece I8 and the adjacent lower angle piece I9.

The bottom section of the boom includes, in addition to the upper angle pieces I8, I8 and the lower angle pieces I9, I9, a series of obliquely disposed T-bars 20 at each side of the boom, said T- bars 20 being welded to inner surfaces of adjacent angle pieces I8, I9 as at 2|, with the body portions of the T-bars extending inwardly as shown. At each side of the boom, alternate T- bars 20 are parallel with each other and adjacent T-bars 20 are in oblique relation to each other to all but meet, as in Fig. 5, at location where said T-bars are welded to the angle pieces. The T- bars Zilat one side of the boom are in staggered relation to the T-bars 20 at the other side of the boom, as shown more clearly in Figs. 1 and 2, so that a lattice effect is'the result.

The bottom section of the boom also includes a series of T-bars at the upper and lower surfaces of said boom. Of these T-bars, 22 denotes upper, obliquely disposed T-bars each having its bottom end welded to a lower portion of anangle piece I8, and 23 represents similar lower, obliquely disposed Tbars" each having its bottom end welded to alower portionof an angle piece I9. The T-bars 22 and 23 are at the outer surfaces of the angle pieces, and the body portions of said T-bars 22 and 23 extend outwardly from the boom.

The upper end of eachobliqueT-bar 22 is Welded to anupper plate 24, and the upper end of each oblique T-bar 23 is welded to a lower plate 25, said plates 24 and 25 being at the transverse center of the boom and at the elevations of the angle pieces I8 and i9, respectively. An upp r T-bar 28' extends transversely of the boom and has its opposite ends welded to the inner surfaces of the angle pieces l8, l8, and a lower T-bar 21, directly beneath the T-bar 26, also extends transversely of the boom and has its opposite ends welded to the inner surfaces of the angle pieces l9, l9. The body portions of the T-bars 26 and 21 extend inwardly of the boom. The plate 24 is welded to the T-bar 25, and the plate 25 is welded to the T-bar 21. A reinforcing plate 28 at the transverse center of the boom has its upper and lower edge portions welded to the T-bars 26 and 21, respectively. Each of upper, oblique T- bars 39 has its bottom end welded to an intermediate portion of a T-bar 22 and its top end welded to an angle piece It, and each of lower, oblique T-bars 49 has its bottom end welded to an intermediate portion of a T-bar 23 and its top end welded to an angle piece I9. The bodyjportions of the T-bars 39 and 49 extend inwardly of the boom.

Each of upper, obliquely disposed T-bars 29 has its bottom end welded to the plate 24 and its top end welded to an angle piece l8, and each of lower, obliquely disposed T-bars 30 has its bottom end welded to the plate 25 and its top end welded to an angle piece i9. The body portions of the T-bars 29 and 33 extend inwardly of the boom. An upper T-bar 3| extends transversely of the boom and has its opposite ends welded to the inner surfaces of the angle pieces l8, l8, and a similar lower T-bar has its opposite ends Welded to the inner surfaces of the angle pieces I9, I9. .The body portions of the T-bar 3| and the similar T-bar directly beneath said T-bar 3| extend inwardly of the boom. The T-bar 3| all but meets the top ends of the T-bars 29, as shown more clearly in Fig. 7, and the lower T-bar which is similar to the T-bar 3| bears this same relation to the top ends of the T-bars 30. A plate 32 is welded to the upper surface of the flange of the T-bar 3| at the transverse center of the boom, and a similar plate is welded to the lower surface of the flange of theT-ba'r similar to the T-bar 3| also at the transverse center of the boom.

Each of upper, obliquely disposed T-bars 33 has its bottom end welded to the plate 32 and its top end welded to an angle piece [8, and each of lower, obliquely disposed T-bars similar to the T-bars 33 has its bottom end welded to the lower plate similar to the plate 32 and directly therebeneath and its top end welded to an angle piece IS. The body portions of the T-bars 33 and the lower T-bars similar thereto extend inwardly of the boom. An upper T-bar 34 extends transversely of the boom and has its opposite ends welded to the inner surfaces of the angle pieces i8, i8, and a similar lower T-bar has its opposite ends welded to the inner surfaces of the angle pieces I9, IS. The body portions of the T-bar 34 and the similar T-bar directly opposite said T-bar 34 extend inwardly of the boom. The T-bar 34 all but meets the top ends of the T-bars 33, and the lower T-bar which is similar to the T-bar 34 bears this same relation to the top ends of the T-bars beneath and similar to the T-bars 33. A plate 35 is welded to the upper surface of the flange of the T-bar 34 at the transverse center of the boom, and a similar plate is welded to the lower surface of the flange of the T-bar similar to the T-bar 34 also at the transverse center of the boom..

Each of upper, obliquely disposed T-bars 36 has its bottom end welded to the plate 35 and its top end welded to an angle piece l8, and each of lower, obliquely disposed T-bars similar to the T-bars 35 has its bottom end welded to a lower plate similar to the plate 35 and directly therebeneath and its top end welded to an angle piece I9. The body portions of the T-bars 35 and the lower T-bars similar thereto extend inwardly of the boom. An'upper T-bar 31 extends transversely of the boom and has its opposite ends welded to the inner surfaces of the angle pieces l8, l8, and a similar lower T-bar has its opposite ends welded to the inner surfaces of the angle pieces l9, IS. The body portions of the T-bar 3i and the similar T-bar directly beneath said T-bar 31 extend inwardly of the boom. The T- bar 31 all but meets the top ends of the T-bars 35, and the lower T-bar which is similar to the T-bar 31 bears this same relation to the top ends of the T-bars beneath and similar to the T-bars 33.

A series of obliquely disposed T-bars 33 at the upper and lower surfaces of the boom are welded to inner surfaces of adjacent angle pieces l8, l8 and |9, |9, respectively, with the body portions of said T-bars 38 extending inwardly of the boom. At each of the upper and lower surfaces of the boom, alternate T-bars 38 are parallel with each other and adjacent T-bars 38 are in oblique relation to each other to all but meet, as in Fig. 7, where said T-bars are welded to the angle pieces. The T-bars 38 opposite each other, at the upper and lower surfaces ofthe boom, are in staggered relation, as shown very clearly in Figs. 7 and 8, so that a lattice efiect is the result.

The bottom section of the boom is joined to the top section thereof at location just above the T-bars 20 and 38, one of said sections, the bottom section as disclosed, permanently supporting means for making the connection between the sections. At the location between said sections, the bottom section is reinforced by eight plates, including upper plates 4|, 4| attached to the horizontal arms of the angle pieces I8, I 8, upper plates 42, 42 attached to the vertical arms of said angle pieces I8, l8, lower plates 43, 43 attached to the horizontal arms of the angle pieces |9, l9, and lower plates 44, 44 attached to the vertical arms of said angle pieces |9, |9. The plates 4|, 42, 43, and 44 are on the outer surfaces of the arms of the angle pieces and terminate approximately flush with the apices of said angle pieces. As shown, said plates and angle pieces are secured together by rivets 45, but could be welded to each other. Each plate 4|, 42, 43, and 44 includes portions thereof extending upwardly beyond the top of, and inwardly beyond the inner edge of, the angle piece arm carrying said plate.

An upper T-bar 46, arranged transversely of the boom, has the opposite ends of its flanges welded to the inner surfaces of the inwardly extending portions of the plates 4|, 4|, with the body portion of said T-ba'r 46 extending inward- 1y of the boom. A lower T-bar 41, also arranged transversely of the boom and disposed opposite said T-bar 46, has the opposite ends of its flanges welded to the inner surfaces of the inwardly extending portions of the plates 43, 43, with the body portion of said T-bar 4'! extending inwardly of the boom. And each of side T-bars 48, in the plane of the T-bars 46 and 41, has the opposite ends of its flanges welded to the inner surfaces of the inwardly extending portions of adjacent plates 42, 44, with the body portions of said T-bars 48- extending inwardly of the boom. Bracing plates 49, one adi-acenteach corner of the boom, are welded to the opposite ends of the body portionsof the T-bars 46, 4'8. and 41, 48, respectively, and a T-bar 5|] extends between opposite bracing plates 49 and has its ends welded thereto.

The lower parts of the angle pieces I8, I'll, l9 and |9.of the top section of the boom are provided. with bolt holes 5| which are adapted to al-ine with bolt holes 52' in the upward extensions of the plates 4|, 42, 43, and 44. Bolts. 53 in. said bolt holes 5| and 52 detachably con-=- nect the bottom and top sections of the boom together with corresponding angle pieces of the different boom sections in alinement, as is ap-- parent. The lower part of the top section of the boom includes an oblique T-bar 54 at one side of said boom welded at. its upper end to an angle piece I8 and having bolt. holes 55 at its lower end adapted. to aline with bolt holes 55in a plate 44. Bolts: 5'! connect. said T-bar 54 with said plate 44., An oblique IF-bar 58 at the other side of the boom, opposite the T-bar 54, is welded at its upper end to an angle piece l9: and has bolt holes 59 at its lower end adapted to aline with bolt holesBfl in a plate 42. Bolts Bl connect said T-bar 58 with said plate 42.. An oblique. T-bar 62 at the upper surface of the lower part of the top section of the boom is welded at its upper end to an angle piece l8 and bolted at 63 to aplate 4|. An oblique T-bar 64 at the lower surface of the lower part of the top section of the boom, oposite the T-bar 62', is welded at its upper end to an angle piece I9 and; bolted at B5 to a plate 43. Thebody portions of the T-bars 54, 58, 62,. and 64 extend inwardly of the boom, and the flanges of said T-bars are cut away at the locations where the T-bars are bolted. Y

Directly above the T-bars 54 and 58 the top section of the boom includes an additional series of obliquely disposed T-bars 20 at each side of said boom, which additional T-bars 20 are welds ed into: the boom structure and have the same relative arrangement to the angle pieces and to each. other as hereinbeforedescribed.

Directly above the T-bars- 62 and 64', the top section of the boom includes a series of T-bars at the upper andlower surfaces of said boom. Of these T-bars, 56- denotes an upper T-bar extending. transversely of the boom and having its opposite ends welded to the inner surfaces ofthe angle. pieces I8, l8. A lower T-bar, similar to the T-bar 66 and directly opposite said T-bar 66, has its opposite ends welded to the inner surfaces of the angle pieces I9, I9. The body portions of the T-bar and the similar, directly opposite T-bar extend inwardly of the boom.

Directly above the T'-bar 66. and the lower, similar T-bar opposite said T-bar 66, the top section of the boom includes an additional series of obliquely disposed T-bars 38 at the upper and lower surfaces. of said boom, which additional T-bars. 38 are welded into the boom structure and have the same relative arrangement to the angle pieces andato.v each other as before. set forth.

Reinforcing plates 6'|, ,one at each side of the upper. part of the top section of the boom, are welded to. the outer surfaces of the upper and lower angle-pieces |8, I9 and l8, l9, respectively; as shown more clearly in- Figs. 2,6,. 311C138. The outerend. ofi eachplate 61:- terminates about flush with the upper or outer ends of the angle pieces of the boom. The inner end portion of each plate 61 extends vto position along .the boom below theelevati on of one or more additional T-bars 20 and 38. The upper edge of each plate 61 terminates about flush with the upper surface of the boom, and the lower portion of each plate 6'1 extends below the lower surface of the boom. A reinforcing plate 68 extends transversely of the upper or outer end of the boom and is welded to the ends of'the angle pieces l8, l8, |9, |9. Small plates 69 are welded to the outer surfaces of the plates 61 at location adjacent to the upper or outer end of the boom, and a shaft 19 for sheaves H is suitably mounted in each of the opposite plates61 and 69. A cable guard 12 for the sheaves II is associated with said sheaves in any ordinary or preferred manner. Small plates 13 are welded to the outer surfaces of the plates 61 at location slightly inwardly from the plates 69, and support, together with said plates 61, pins or pivots 14 which attach links 15 to the boom. The links 15 in turn carry sheaves 16, and suitable cables. 11 for controlling theboom areasso'ciated with said links 15 and sheaves I5. A reinforcing: plate 18 extends transversely of the boom at. the inner sides of the plates. 15 and adjacenttotheadditional T-bars 38. Said. plate 1.8 is welded to the-inner surfaces of the plates 81 and the angle pieces.

Reinforcing plates 19, one at. the upper surface and one. at thelower'surface of the boom, extend transversely of said boom and are welded to the outer surfaces of arms of the angle pieces 13, i8, and I5, I9 respectively. The outer cxtremities of the plates. 19 terminate. just below or inwardly of the sheaves H, and. the inner end portions of said plates 19 extend to position along the boom. below the elevation of one or morecadd'itional T-bars 2G and 38. Reinforcing bars 80, disposed just to. the rear of the plates 69 at either side of the boom, extend vertically between the angle pieces #8, i9 and |8, l9, respectively, at the inner sides of. the plates 61,, 6-1, and are welded to said angle pieces and plates. The reinforcing plates 6], 6? include hand holes 9D.v

' While the illustration as. made in the drawings and the description as given are of ab'oom consisting of two sections, one. a lower section and the other an upper section, attention iscalled to; the fact that the boom can be constructed as a single section extending the length of the boom, or can consist of more than two sections. In. the latter event, additional sections could be connected into the boom structure in the manner as hereinbefore fully set forth, or in any suitable and preferred manner.

The inner or'lower end portion or the bottom section of the boom carries supporting. bearing members 8!, one at. each side of the boom, for said boom. Lcngitudinally extending reinforcing plates 92, one at each side of the boom, are welded to the outer surfaces of the angle pieces |8, l9 and I8, I9, respectively, and each bearing member 8| includes an integral web or attachment portion 83 which is riveted, as at 84', to the lower or bottom parts of the adjacent plate 82 and the adjacent angle pieces l8, Hi. The webs or attachment portions 83 are at the inner sides of the angle pieces, and each web or attachment portion 83 has relation to its bearing member 8| and to the adjacent-angle pieces [8,. la-situating the. bearing members. 8| at the midthickness of the boom. Eachi bearing member Bzl is desirably in a, plane including: the'ang-le pieces |-8:,; H! at the corresponding side of the boom. Numeral85 denotes openings providing opposed bearing surfaces of each bearing member 8|, all of which bearing surfaces 85 are in a line extending transversely of the boom at the midthickness thereof.

Upstanding plates 85, welded to either side of the forwarder boom and of a desirably revolvable platform 31, provide means cooperating to support the boom upon said platform. That is to say, said plates 85 constitutespaced apart bearing blocks upon which the boom is mounted.

Each bearing block Bfiincludes an opening 38, said openings lying in a line extending transversely of the platform 81. The boom is mounted upon the bearing blocks 86 by means of pins 89, one for each bearing block and each bearing member 8!, which pins are suitably retained in the openings 85 of the bearing members 8! and in the openings 88 of the bearing blocks. Each bearing lock 86 is between opposed bearing surfaces of a bearing member El, and washers Si are situated between the bearing blocks and the adjacent bearing surfaces of the bearing members.

What is claimed is:

1. Boom construction comprising a plurality of boom sections each including longitudinallyextending elongated'side frame members at more than two corners of the boom construction, reinforcing members attached to the side frame members of each boom section and connecting all of the side frame members of the corresponding boom section into an integral structure, and means for detachably connecting difierent boom sections to each other with corresponding elongated side frame members of the different boom sections in alinement, said connecting means consisting of a series of plates including a plate attached to each of more than two different side frame members of a boom section and overlapping with an adjacent portion of the corresponding side frame member of a different boom section, said plates and their overlapping portions together providing means for guiding boom sections relatively to each other to be connected, means for detachably connecting each plate to the corresponding side frame member with which the plate overlaps, and obliquely disposed reinforcing members each having one of its ends connected to a side frame member and its other end connected to one of said plates, at least one connection for each obliquely disposed reinforcing member being a detachable connection.

2. Boom construction comprising upper and lower longitudinally extending side frame members, transversely extending reinforcing members attached to the upper and'lower side frame members at all of the top, bottom and side surfaces of the boom construction and connecting all of the side frame members into an integral structure, oppositely disposed reinforcing plates at an end portion of the boom construction between and connecting adjacent upper side frame members and adjacent lower side frame members, respectively, oppositely disposed reinforcing plates adjacent the plates just mentioned and between and connecting adjacent upper and lower side frame members, respectively, at each side of the boom construction, sheaves supported by said last mentioned plates, and mounting means for the boom construction at the end thereof opposite said plates.

3. Boom construction comprising upper and lower longitudinally extending angle piece side frame members one at each corner of the boom construction, transversely extending reinforcing members attached to the arms of the upper and lower angle piece side frame members at all of the top, bottom and side surfaces of the boom construction and connecting all of said angle piece side frame members into an integral structure, oppositely disposed reinforcing plates at an end portion of the boom construction between and connecting arms of adjacent upper angle piece side frame members and arms of adjacent lower angle piece side frame members, respectively, oppositely disposed reinforcing plates adjacent the plates just mentioned and between and connecting arms of adjacent upper and lower angle piece side frame members, respectively, at eachside of the boom construction, sheaves supported by said last mentioned plates, and mounting means for the boom construction at the end thereof opposite said plates.

4. Boom construction comprising upper and lower longitudinally extending side frame members, transversely extending reinforcing members attached to the upper and lower side frame. members at all of the top, bottom and side surfaces of the boom construction and connecting all of the side frame members into an integral structure, oppositely disposed reinforcing plates between and connecting adjacent upper'and lower side frame members, respectively, at each side of the boom construction, supporting bearing members at opposite sides of the'boom construction and each having a web overlapping with and connected to a reinforcing plate and side frame members at the corresponding side of said boom construction, sheave supporting members at the end of the boom construction opposite said reinforcing plates, and a sheave supported by said sheave supporting members.

5. Boom construction comprising upper and lower longitudinally extending angle piece side frame members one at each corner of the boom construction, transversely extending reinforcing members attached to the arms of the upper and lower angle piece side frame members at all of the top, bottom and side surfaces of the boom construction and connecting all of said angle piece side frame members into an integral structure, oppositely disposed reinforcing plates at an end portion of the boom construction between and connecting arms of adjacent upper and lower angle piece side frame members, respectively, at each side of the boom construction, supporting bearing members at opposite sides of the boom construction and each having a web overlapping with and connected to a reinforcing plate and arms of side frame members at the corresponding side of said boom construction, sheave supporting members at the end of the boom construction opposite said reinforcing plates, and a sheave supported by said sheave supporting members.

6. Boom construction comprising a plurality of boom sections each including upper and lower longitudinally extending side frame members arranged at more than two corners of the boom construction, reinforcing members attached to said upper and lower side frame members at all of the surfaces of each boom section, means for detachably connecting said boom sections to each other with corresponding upper and lower side frame members of the different boom sections in alinement, said connecting means consisting of a series of plates overlapping with adjacent end portions of each of said corresponding upper and lower side frame members and arranged against the outer surfaces thereof, means permanently attaching each plate to a side frame member of one of said boom sections and means for detachably fastening each plate against a side frame member of another of said boom sections, obliquely disposed reinforcing members, means permanently attaching an end portion of each obliquely disposed reinforcing member to a side frame member, and means for detachably fastening the other end portion of each obliquely disposed reinforcing member to one of said plates.

7. Boom construction comprising a plurality of boom sections each including upper and lower longitudinally extending side frame members arranged at more than two corners of the boom construction, reinforcing members attached to said upper and lower side frame members at all of the surfaces of each boom section and extending crosswise of the boom construction, a series of plates for connecting different boom sections in alining relation to each other, said plates overlapping with adjacent end portions of each of corresponding upper and lower side frame members, means attaching each plate toside frame members, respectively, of different boom sections, all of the side frame members of at least one of said boom sections being removable from said plates, obliquely disposed reinforcing members, a connection between one end portion of each obliquely disposed reinforcing member and a side frame member, and a connection between the opposite end portion of each obliquely disposed reinforcing member and a plate, at least one of said connections for each obliquely disposed reinforcing member being a detachable connection.

8. Boom construction comprising a plurality of boom sections each including upper and lower longitudinally extending side frame members arranged at more than two corners of the boom (construction, reinforcing members attached to said upper and lower side frame members at all of the surfaces of each boom section, a series of 'plates for connecting different boom sections in alining relation to each other, said plates overlapping with adjacent end portions of each of corresponding upper and lower side frame members, means attaching each plate to side frame members, respectively, of different boom sections, all of the side. frame members of at least one of said boom sections being removable from said plates, obliquely disposed reinforcing and boom section connecting members, and connections between the opposite end portions of said reinforcing and boom section connecting members and different boom sections, respectively, at least one connection for each reinforcing and connecting member being a detachable connection.

ROLF E. LJUNGKULL. 

